Mechanism for operating tables for forging-presses, shears, &amp;c.



v T. E HOLMES.

MECHANISM FOR OPERATING TABLES FOR FORGING PRESSES, SHEARS, &c.

. APPLIEATION FILED MAR. 24, 1913.

1,165,174. Patented Dec. 21, 1915.

3 SHEETS-SHEET 1.

' FIG. 1

INVENTQR. K Mm WITNESSES.

POLUMBM PLANrMmvH c0..wA5HlNaTON. n.c1

MECHANISM FOR 0P To $1.2 R

co w l me" 11.

I= F in T. E. HOLMES. ERATING TABLES FOR FORGING PRESSES, SHEARS, &c.

APPLICATION FILED MAR. 24. 1913.

- Patented Dec. 21, 1915.

3 SHEETS-SHEET 2.

INVENTOR.

COLUMBIA PLANOGRAPH CO.,WASHINGTON. D. c.

T. E. HOLMES.

MECHANISM FOR OPERATING TABLES FOR FORGING PRESSES, SHEARS, &c.

APPLICATION FILED MAR. 24, I913.

Patented Dec. 21,1915.

3 SHEETS-SHEET 3.

M Q S I\ N I? I I I I I 0 g) I Em I m N m kkI) I o IQ LI (9 9 LL 1 9 u.

M I N WITNESSES N \s MC/WIET \fl CDLUMBIA PILANOGRAPH CO.,\VASHINOTON,DI c.

, U -l STATES FFTC.

THOMAS EDlVIUND HOLMES, OF SHEFFIELD, ENGLAND, ASSIGNOR T UNITED ENGI-NEERING AND FOUNDRY 00., OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OFPENNSYLVANIA.

MECHANISM FOR orniaa'rrne TABLES For. rename-reassess, srrnans, 8m.

Specification of Letters Patent.

Patented Dec. 21, 1215.

Application filed March 24, 1913. Serial No. 756,430.

To all whom it may concern 7 Be it known that I, THOMAS EDMUND HOLMES, asubject of the King of Great Britaim-andresident of Sheilield, England,have invented a new and useful Improvement in Mechanism for OperatingTables for Forging-Presses, Shears, ,&c.; and I do hereby declare thefollowing to be a full, clear, and exact description thereof.

My invention relates to table operating mechanism for forging presses,shears, or other devices to which it may be found applicable.

I The main object of my invention is to provide deflecting or fallingtables whose movement is controlled by the movement of the press-head,shear or other moving member, whereby the tables are lowered apredetermined proportion of the amount the moving member descends underpower.

To these ends my invention consists, generally stated, in tableoperating mechanism comprisin the cylinder which operates themoving-member, movable tables, and mechanism for lowering said tablesoperated by the downward movement of said moving member, whereby saidtables will be lowered an amount corresponding to the descentof saidmember under power.

In the accompanying drawings Figure 1 is a plan view of my inventionapplied to a forging press; Fig. 2 is a vertical side elevation of same;Fig. 3 is a view showing the parts in the position when the forgingoperatlon takes place; Flg. l is a cross-section on the line H Fig. 2;Fig. 5 is a detail of a valve showing the different connections thereto;and Fig. 6 shows my invention applied to a shear.

In the drawing the numeral 2 designates the base-plate which is boltedor otherwise secured to the foundation 3. Upon the base 2 is the supportl which carries'the anvilblock 5. Supported on the base 2 are thecolumns 6. The cross-head 7 is fitted to move up and down on the columns6. The press-head or top-tool 8 is carried by the cross-head 7. 'Thepressing cylinder 9 contains the ram 10 which is connected up to the Icross-head 7. The inlet 11 is provided for fluid to thepressing-cylinder. Lifting cylinders 12 are arranged on each side of thepress for lifting the press-head in the ordinary manner.

Supported on the base 2 are thecylinders 13 and 13 at opposite sides ofjthe presshead. The rams 14 of said cylinders 13 and 13 are attached tothe cross-head 7 and said rams are raised and lowered by the movement ofsaid cross-head. The cylinders 13 and 13 are connected up to the tank 15by the pipes 16 and 17, respectively. During the initial movement of thepress-head, and before the increased pressure due to the intensifieracts on said press-head to perform the forging operation, the watercontained within the cylinders 13 and 13 will pass to the tank 15 forthe reason more fully herelnafter set forth. Valves 1.9 and are locatedin the pipes 16 and 17 and the construction of said valves isillustrated in detail in Fig. 5.

A pipe 21 connects up with the valve 19 and said pipe leads to thecylinder 22. The pipe 21 leads from the valve 19 to the tank 15. Thepiston-r0 23 of the cylinder 22 is connected with the ram 24L of thecylinder 25.

By these cylinders 22 and 25 themechanism' for raising and lowering thetable 26 is operated and this mechanism consists of the following parts:The arm 27 is carried by the shaft 27 mounted in the brackets 28. Theother end of the arm 27 is connected to the linln 29 connected to thetable 26. An arm 30 is connected to the rod 31, and at its lower end tothe piston-rod 23. The rod 31 is connected to the arm 32. One end 33 ofsaid arm is connected to the piston-rod 34: of the cylinder 25. The arm35 is mounted on the shaft 35 and is connected at its opposite end tothe link 36 attached to the table 26.

The table 26 is provided with the ordinary rollers 37.

The pipe 38 is connected up with the valve 20 and said pipe is connectedup with a cylinder 22. As the mechanism for operating the table 39 isthe same as that illustrated and described in connection with the table26, it has not been deemed necessary to refer to the same in detail asthe same reference numerals are applied to, each.

The rollers of the tables 26 and 39 are A tank 43 which is ordinarilycalled the Pressure in tank 15 is greater than in tank pre-filler ischarged, with air and water a under suitable pressure, and serves as areservoir from which water can be drawn or to which it can be returnedto make up for the displacement of the main ram 10. A pipe 4% isconnected up with the tank 13 and to a suitable valve 15, essentially acheck valve, normally allowing water to flow from the pre-filler butarranged to be opened mechanically to allow water to be returned to sameat the proper time, which controls the supply from the tank -13 as wellas from the intensifier 46. A pipe 17 connects the valve 45 with thepressing-cylinder 9.

The intensifier may be of. any suitable constructionand as it forms nopart of my invention, it has not been deemed necessary to illustrate thesame in detail. A pipe 48 leads from the intensifier to the valve 4:5.Furthermore a pipe 4-9 connects the valves 19 and 20 up with theintensifier or the pipe leading therefrom.

A tank oraccumulator 50 is connected up by the pipes 51 and 52 to thecylinders 25 and this pressure acts under normal conditions to maintaintheftables 26 and 39 in their raised position until this pressure isovercome in the manner hereinafter set forth.

. In the operation of forging, the piece to beforged is placed on one ofthe tables and is fed from. any proper position with reference to thepress-head. The initial movement of the press-head s obta ned byexhausting the steam pressure from the lifting in contact with the pieceto be forged, the

steam is admitted to the intensifier and the closing of valve 15 cutsoff the supply from the pre-filler 13. As soon as the pressure isadmitted to the intensifier the fluid in the pipes 48 and 17, as well asin the other pipes, is compressed and this increased pressure isimparted to the ram of the press-head and the pre'sshead' is forced soas to squeeze the metal held between the upper and lower press-heads. Atthe same time that the intensifier is put in operation, the pressureexerted by the same through the pipe 419 closes the ports in the valves19 and 20 which communicate with the tank 15.

-13, andconsequently valves 19 and20 are normally open, 7 hen theintensifier 4E6 forces .high pressure water into pipe 48, the valve 15closes and the high pressure water also enters pipes 49,"and overcomesthe pres- I sure tending to keep the valves 19' and 20 open, and thuscloses 'said valves; -This closing of the ports leading to the -tank 15forces the fluid from the cylinders13 and 13 through the pipes 21 and 38to the cylinders This'takes place as soon as the forging operationbegins, the cylinders 13 and 13 being brought into communication withthe pipes 21 and 38. Accordingly the water in this pipe-system iscompressed and the pressure operates on the pistons in the cylinders 22which overcome theip'ressure in the cylinders 25 fromthe accumulator ortank 50, so that the-fluid in the cylinders 25 is forced back into thetank 50. This movement of the piston-rods23 and:3'-1 will 'act to lowerthe tables 26 and 39through the connection hereinbefore described, sothat said tables are lowered an amount corresponding practically totheamount thatthe ,press-head descends under-the pressure exertedby theintensifier,,and as'the presshead rises, the tables, under the influenceof the accumulator pressure, again rise to their initial position toallow the piece which is being forged to be moved forward for anotherstroke of the press.

In Fig. 6 I have illustrated my invention as applied to a steamhydraulicbloomfshear of the down-cut type. In this shear the table wouldonly be'required on one side opposite the hold-down,.or the back-of theshear. The cross-head 61 is fitted to move on the column 62. Thecylinder 63 contains the ram 63 which is connected to the crosshead 61.The upper knife 64- is carried by the cross-head 61 and the lower knifeby the base 65. An ordinary hold-down 66 is provided. In operation thetable will be lowered an amount slightly in excess of the travel ofthehead under the intensifier pressure, instead of'half this amount as inthe forging-press. '\Vhat I claim is: v I p 1. In table operatingmechanism, the combination of a head, means for lowering same,

7 a movable table, and fluid-pressure operated means operated by thelowering of said head under power to lower said table.

1 2. In table operating mechanism, the combination of a 7 head, meansfor lowering same, a fluid-pressure sustained table, and

fluid-pressure operated means .operatedby the lowering of said headunder powerto overcome the fluid pressure sustaining said table.

In table operating mechanism, the combinationof a head, means forlowering same, a movable table, and fluid-pressure, operated means forlowering said table an at of the amount corresponding to the amoudescent of said head under power. 1

4. In table operating-mechanisnnthe coin-f bination of a' pressingcylinder, a head adapted to be lowered thereby,a cylinder, a ramtherein, connections between said ram and said head, a tank, connectionsbetween said tank and said second cylinder, a valve controlling saidconnections, said valve be ing open to said reservoir during the initialmovement of said head, an intensifier, connec-tions between saidintensifier and said pressing-cylinder, connections between saidintensifier and said valve, whereby said valve is closed to saidreservoir by increased pressure caused by said intensifier, a table,atable operating cylinder with fluid pressure therein normallysustaining said table, and means for directing the fluid-pressure fromsaid second named cylinder to said table operating cylinder when saidvalve is closed to overcome the table sustaining pressure, wherebysaid-table is lowered.

5. In table operating mechanism, the combination of a pressing cylinder,a head adapted to be lowered thereby, a cylinder, a ram therein,connections between said ram and said head, a tank, connections betweensaid tank and said second cylinder, a valve controlling saidconnections, said valve being open to said reservoir during the initialmovement of said head, an intensifier, connections between saidintensifier and said pressing cylinder, connections between saidintensifier and said valve whereby said valve is closed to saidreservoir by increased pressure caused by said intensifier, a table, atable operating cylinder with fluid pressure therein normally sustainingsaid table, lever mechanism, a piston in said cylinder, con nectionsbetween said piston and lever mechanism for raising and lowering said.table, a cylinder in tandem with said oper- Copies of this atingcylinder, a piston connected up to the piston of said table operatingcylinder, and connections between said second cylinder and said valve,whereby the fluid pressure in said second named cylinder is forcedthrough said valve into said tandem cylinder to overcome the pressure insaid table operating cylinder to lower said table.

'6. In table operating mechanism, the combination of apressing-cylinder, a head adapted to be lowered thereby, a cylinder, aram therein, connections between said rain and said head, a tank,connections between said tank andsaid second named cylinder, a valvecontrolling said connections, said valve being open to said reservoirduring the initial movement of said head, an intensifier, connectionsbetween said intensifier and said pressing cylinder, connections betweensaid intensifier and said valve whereby said valve is closed to said reservoir by increased pressure caused by said intensifier, a table, tandemcylinders, a rod, connecting the pistons of said tandem cylinders, oneof said tandem cylinders normally sustaining said table, and connectionsbetween the other of said tandem cylinders and said valve, whereby thefluid in said second named cylinder is forced through said valve intosaid other of said tandem cylinders to overcome the pressure in thetable sustaining cylinder.

In testimony whereof, I, the said THOMAS EDMUND Homrns, have hereuntoset my hand.

TlHOliliraS EDMUND HOLME Witnesses LUTHER J. PARK, RICE K. EVANS.

patent may be obtained for five cents each, by addressing theCommissioner of Patents,

Washington, D. C.

